NO952074L - Process of bleaching lignocellulosic pulp - Google Patents

Process of bleaching lignocellulosic pulp

Info

Publication number
NO952074L
NO952074L NO952074A NO952074A NO952074L NO 952074 L NO952074 L NO 952074L NO 952074 A NO952074 A NO 952074A NO 952074 A NO952074 A NO 952074A NO 952074 L NO952074 L NO 952074L
Authority
NO
Norway
Prior art keywords
pulp
bleaching
brightness
stages
lignocellulosic pulp
Prior art date
Application number
NO952074A
Other languages
Norwegian (no)
Other versions
NO952074D0 (en
NO306737B1 (en
Inventor
Magnus Linsten
Jiri Basta
Ann-Sofie Haellstroem
Original Assignee
Eka Nobel Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26661599&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=NO952074(L) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from SE9203584A external-priority patent/SE9203584D0/en
Priority claimed from SE9300225A external-priority patent/SE9300225D0/en
Application filed by Eka Nobel Ab filed Critical Eka Nobel Ab
Publication of NO952074D0 publication Critical patent/NO952074D0/en
Publication of NO952074L publication Critical patent/NO952074L/en
Publication of NO306737B1 publication Critical patent/NO306737B1/en

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1042—Use of chelating agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/16—Bleaching ; Apparatus therefor with per compounds
    • D21C9/166—Bleaching ; Apparatus therefor with per compounds with peracids

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Micro-Organisms Or Cultivation Processes Thereof (AREA)

Abstract

The present invention relates to a process for bleaching of lignocellulose-containing pulp, where the pulp is first treated with a complexing agent, then delignified with an organic peracid or a salt thereof, and subsequently bleached with a peroxide-containing compound, ozone or sodium dithionite. Before bleaching, the pulp is washed at a pH of at least about 4. Suitably, delignification is performed with the strongly oxidizing peracetic acid, so that a considerable increase in brightness as well as a considerable reduction of the kappa number are obtained after said bleaching. The brightness-increasing effect is very selective, i.e. the viscosity of the pulp is maintained to a relatively great extent. By a suitable choice of pH in all the stages before the chlorine-free bleaching, the advantageous metal ions are retained in the pulp, while at the same time the pH adjustment between the stages is minimized and the resulting spent bleach liquors are advantageously used internally, e.g. for washing the pulp.
NO952074A 1992-11-27 1995-05-26 Process of bleaching lignocellulosic pulp NO306737B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9203584A SE9203584D0 (en) 1992-11-27 1992-11-27 PROCEDURES FOR BLACKING OF LIGNOCELLULOSALLY MACHINE
SE9300225A SE9300225D0 (en) 1993-01-26 1993-01-26 PROCEDURES FOR BLACKING OF LIGNOCELLULOSALLY MACHINE
PCT/SE1993/001018 WO1994012722A1 (en) 1992-11-27 1993-11-25 Process for bleaching of lignocellulose-containing pulp

Publications (3)

Publication Number Publication Date
NO952074D0 NO952074D0 (en) 1995-05-26
NO952074L true NO952074L (en) 1995-07-26
NO306737B1 NO306737B1 (en) 1999-12-13

Family

ID=26661599

Family Applications (1)

Application Number Title Priority Date Filing Date
NO952074A NO306737B1 (en) 1992-11-27 1995-05-26 Process of bleaching lignocellulosic pulp

Country Status (16)

Country Link
EP (1) EP0670929B2 (en)
JP (1) JPH08503749A (en)
AT (1) ATE141972T1 (en)
AU (1) AU671337B2 (en)
BR (1) BR9307520A (en)
CA (1) CA2149649C (en)
CZ (1) CZ285246B6 (en)
DE (1) DE69304342T3 (en)
ES (1) ES2091121T3 (en)
FI (1) FI118572B (en)
MX (1) MX9307413A (en)
NO (1) NO306737B1 (en)
NZ (1) NZ258273A (en)
PL (1) PL309190A1 (en)
RU (1) RU2097463C1 (en)
WO (1) WO1994012722A1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1007757A3 (en) * 1993-11-10 1995-10-17 Solvay Interox Method of laundering of chemical pulp.
US5656130A (en) * 1995-04-28 1997-08-12 Union Camp Holding, Inc. Ambient temperature pulp bleaching with peroxyacid salts
USH1690H (en) * 1995-07-20 1997-11-04 Nye; Jeffrey Process for bleaching kraft pulp
SE9503004L (en) * 1995-08-30 1997-03-01 Sunds Defibrator Ind Ab Bleaching of pulp
DE19704054C2 (en) * 1997-02-04 2000-08-10 Stockhausen Chem Fab Gmbh Process for the production of fibrous materials with improved properties
US6702921B2 (en) * 2001-05-01 2004-03-09 Ondeo Nalco Company Methods to enhance pulp bleaching and delignification using an organic sulfide chelating agent
EP1607519B1 (en) * 2004-06-14 2008-02-20 Warwick International Group Limited Activator for pulp bleaching

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2219505C3 (en) † 1972-04-21 1974-10-17 Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler, 6000 Frankfurt Chlorine-free multi-stage bleaching of cellulose
DE3005947B1 (en) † 1980-02-16 1981-01-29 Degussa Process for bleaching pulp using organic peracid
JPS5721591A (en) † 1980-07-11 1982-02-04 Mitsubishi Gas Chemical Co Peroxide bleaching of wood pulp
ATE97179T1 (en) * 1989-06-06 1993-11-15 Eka Nobel Ab PROCESS FOR BLEACHING LIGNOCELLULOSE CONTAINING PULP.
US5091054A (en) * 1989-08-18 1992-02-25 Degussa Corporation Process for bleaching and delignification of lignocellulosic
BE1004674A3 (en) * 1991-03-11 1993-01-12 Interox Internat Sa Method of laundering of chemical pulp and application of the method of laundering pulp kraft.
DE4114135A1 (en) † 1991-04-30 1992-11-05 Sueddeutsche Kalkstickstoff Chlorine-free bleaching and delignification of alkali cellulose - by first treating with aq. organic peracid soln. and then with cyanamide (salt) activated hydrogen peroxide soln.
EP0535741B1 (en) * 1991-10-04 1998-07-08 Solvay Interox, Inc. Process for improving the selectivity in the delignification of a chemical pulp
BE1006057A3 (en) † 1992-07-06 1994-05-03 Solvay Interox Method for delignification of chemical pulp.

Also Published As

Publication number Publication date
EP0670929A1 (en) 1995-09-13
FI952551A0 (en) 1995-05-24
RU95113460A (en) 1996-12-27
CZ132895A3 (en) 1996-01-17
DE69304342T3 (en) 2004-07-01
MX9307413A (en) 1994-07-29
NO952074D0 (en) 1995-05-26
AU5583194A (en) 1994-06-22
NO306737B1 (en) 1999-12-13
RU2097463C1 (en) 1997-11-27
WO1994012722A1 (en) 1994-06-09
EP0670929B1 (en) 1996-08-28
DE69304342T2 (en) 1997-03-06
PL309190A1 (en) 1995-09-18
NZ258273A (en) 1996-08-27
JPH08503749A (en) 1996-04-23
DE69304342D1 (en) 1996-10-02
ES2091121T3 (en) 1996-10-16
CZ285246B6 (en) 1999-06-16
BR9307520A (en) 1999-08-31
FI118572B (en) 2007-12-31
FI952551A (en) 1995-05-24
CA2149649C (en) 2000-09-19
AU671337B2 (en) 1996-08-22
ATE141972T1 (en) 1996-09-15
EP0670929B2 (en) 2003-10-22

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Legal Events

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Free format text: LAPSED IN MAY 2003